NOS NIB Matched Quad Heintz & Kaufman 5670 [2C51, 396A] Black Plate Vacuum Tubes

NOS NIB Matched Quad Heintz & Kaufman 5670 [2C51, 396A] Black Plate Vacuum Tubes

These are beautiful, absolutely NOS NIB tubes, made in San Francisco USA by Heintz and Kaufman. You don't see many Heintz and Kaufman tubes around these days, let alone a great audio tube like the 5670. There hasn't been a single one listed on eBay in over a year so this may be your only chance to try them! The 5670 is equivalent to the WE 396A and 2C51. Get yours today because these are so hard to find! Everything about these is mint including the lettering and boxes.

Black plates, square getters.

 All of these have been professionally tested and/or matched by Gm on a calibrated Hickok TV-7 tube tester. These are genuine NOS tubes and they will test and perform as such.